Heat some oil in a pan and add the onion; Sprinkle a little.
Fry over high heat until it turns golden, lower the heat, and fry until it starts to brown.
Cover and fry for a few more minutes until completely browned.
In a food processor, place minced garlic and lemon juice and process for a minute or two.
Let the mixture rest for a few minutes in the food processor - to absorb the flavors. (In the meantime, you can chop the parsley, slice the onion, and make t tahini dressing).
Transfer the contents of the can of chickpeas to a small pot and heat slightly. (possible in the microwave)
Drain the chickpeas from the liquids but leave about two tablespoons. Set aside a few chickpea grains for garnish. You can use the drained water to make mayonnaise Add the warm chickpeas and black salt; process for a minute or two (depending on the processor's power) until the chickpeas turn into a paste.
Add water and process for another minute; if necessary, add more water gradually until you get the desired thickness.
taste and adjust seasoning if necessary